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CBSE Class 9 Answered

Water in a canal, 30dm wide and 12dm deep is flowing with a velocity of 20km per hour. How much area wiil it irrigate in 30min. If 9 cm of standing water is desired? (10dm =1m)
Asked by dimplesharma0810 | 05 Mar, 2016, 09:58: AM
answered-by-expert Expert Answer
Width space of space the space canal space equals space 300 cm height space of space the space canal space space equals space 120 cm Velocity space of space water space equals space 20 space km divided by hr space equals space 20 space cross times space 1000 cross times 100 space cm divided by hr Amount space of space water space irrigated space in space 1 space hour space equals space 300 cross times 120 cross times space 20 space cross times space 1000 cross times 100 space cm cubed Amount space of space water space irrigated space in space 30 space min space equals space fraction numerator space 300 cross times 120 cross times space 20 space cross times space 1000 cross times 100 space over denominator 2 end fraction cm cubed Area space irrigated space by space this space water space if space 9 cm space of space satanding space water space is space desired space equals space fraction numerator space 300 cross times 120 cross times space 20 space cross times space 1000 cross times 100 space over denominator 2 cross times 9 end fraction space equals space 4000000000 cm cubed equals space 0.4 km cubed
Answered by Vijaykumar Wani | 07 Mar, 2016, 11:22: AM

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